Fix sky include guards to match Chromium style

sky/engine/wtf/text/StringBuffer.h

 /*
  * Copyright (C) 2008, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  * 3.  Neither the name of Apple Inc. ("Apple") nor the names of its
  *     contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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-#ifndef StringBuffer_h
-#define StringBuffer_h
+#ifndef SKY_ENGINE_WTF_TEXT_STRINGBUFFER_H_
+#define SKY_ENGINE_WTF_TEXT_STRINGBUFFER_H_
 
 #include "sky/engine/wtf/Assertions.h"
 #include "sky/engine/wtf/text/StringImpl.h"
 #include "sky/engine/wtf/unicode/Unicode.h"
 
 namespace WTF {
 
 template <typename CharType>
 class StringBuffer {
     WTF_MAKE_NONCOPYABLE(StringBuffer);
@@ skipping 42 matching lines @@
     ASSERT(m_data);
     if (m_data->length() == newLength)
         return;
     m_data->truncateAssumingIsolated(newLength);
 }
 
 } // namespace WTF
 
 using WTF::StringBuffer;
 
-#endif // StringBuffer_h
+#endif  // SKY_ENGINE_WTF_TEXT_STRINGBUFFER_H_